The Ajax boss has confirmed that his Dortmund counterpart inquired about the Dane's situation and admitted that he is likely to lose players this summer
The Danish playmaker has been touted as a potential replacement for the outgoing Mario Gotze at the Westfalenstadion and admitted recently that he would consider a move to BVB.
And De Boer has now conceded that he is likely to lose at least one of his star players in the close season.
"I expect that three guys will leave," he Is quoted as saying by Voetbal International. “To think that [Toby] Alderweireld, Eriksen and [Siem] De Jong will stay is unrealistic.
"Jurgen Klopp called me this week to congratulate me with the championship. He also asked me how Christian Eriksen is doing. He is a fan."
Eriksen himself has insisted that if no move materialises this summer, he will sign a new contract to ensure that he does not leave the club for free when his current deal expires next summer.
And while De Boer may be preparing himself for life without some key figures, Netherlands international Siem de Jong revealed that no major offers have come his way as yet.
"The competitions in England and Germany will suit me I think," the 24-year old said. "I have improved since last season, but there's no concrete interest at the moment."